[Blimp] Adds Blimp EngineSession and ClientSession skeleton

blimp/common/proto/control.proto

Index: blimp/common/proto/control.proto
diff --git a/blimp/common/proto/client_control.proto b/blimp/common/proto/control.proto
similarity index 64%
rename from blimp/common/proto/client_control.proto
rename to blimp/common/proto/control.proto
index 6d9f605f556ec51e82bb27de57950509b8e713c2..d6d64c4b9a2b60c969c4871488141e7ce0ccc810 100644
--- a/blimp/common/proto/client_control.proto
+++ b/blimp/common/proto/control.proto
@@ -11,19 +11,22 @@ syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
-message NavigateArgs {
+message LoadUrlMessage {
   optional string url = 1;
 }
 
-message ClientControlMessage {
+message ControlMessage {
   enum Type {
-    NAVIGATE = 1;
-    STOP = 2;
-    RELOAD = 3;
-    BACK = 4;
-    FORWARD = 5;
+    // Client <=> Server types.
+    CREATE_TAB = 1;
+    CLOSE_TAB = 2;
+    LOAD_URL = 3;
+
+    // Server => Client types.
+    // Client => Server types.
   }
   optional Type type = 1;
 
-  optional NavigateArgs navigate = 1000;
+  // When the type is LOAD_URL.

[Kevin M, 2015/10/15 22:01:56]

Not necessary; naming convention covers us there.

[haibinlu, 2015/10/15 22:12:32]

Done.

+  optional LoadUrlMessage load_url = 1000;
 }